DAWSON GEOPHYSICAL CO — Director's Dealing 2012

May 11, 2012

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: TGC INDUSTRIES INC (TGE)
CIK: 0000799165
Period of Report: 2012-05-10

Reporting Person: WHITENER WAYNE A (Director, President and CEO)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2012-05-10	Common Stock	S	9381	$10.5776	Disposed	55575	Direct

Footnotes

F1: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $10.55 to $10.642, inclusive. The reporting person undertakes to provide TGC Industries, Inc., any security holder of TGC, or the staff of the SEC, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote.